Working at the post office, I'm used to dealing with a moody public. So, when one irate customer stormed my desk, I responded in my calmest voice,"What' s the trouble?"

"I went out this morning," she began, "and when I came home, I found a card saying the mailman tried to deliver a package, but no one was home. I'll have you know, my husband was in all morning! He never heard a thing!"